In the TV special, Vieira talks with the creative team who brought places like Gringotts Wizarding Bank and Diagon Alley to life. Harry Potter film actors Ralph Fiennes (Lord Voldemort), Helena Bonham Carter (Bellatrix Lestrange) and Bonnie Wright (Ginny Weasley), among others, will also speak with Vieira about their favorite parts of the park.

"Young people will feel that they are actually in it, they're in the movie, they're in the story," the Dark Lord (Fiennes) says. "With the physical reality and the visual reality around them...you can almost reach out and want to touch it. I think it'll be something they'll never forget."

Harry Potter Then and Now

Rupert Grint (Ron Weasley)

We fondly remember young Ron's crippling fear of spiders and ability to be eating in many as scenes as possible. Most recently, Grint made his < a href="http://www.radiotimes.com/news/2013-11-14/harry-potter-star-rupert-grint-makes-his-stage-debut-in-crime-drama-mojo"_target="blank">on-stage debut as a drug-dealing bad boy in "Mojo" -- a far cry from the wide-eyed face on the left.

Image: Nicolas Asfouri/GettyImage: Tim P. Whitby/Getty

Emma Watson (Hermione Granger)

While Watson has grown up, she still hasn't lost touch with the endearingly dorky Hermione. Watson's latest endeavor is a role in the upcoming Biblical epic, "Noah."

Image: George de Sota/GettyImage: Dave Kotinsky/Getty

Tom Felton (Draco Malfoy)

The actor responsible for everyone's favorite antagonist is soon to be starring in the film "In Secret" as a sickly man with whom his cousin is forced into a loveless marriage. When's Felton going to get to play a good guy?

Image: Anthony Harvey/GettyImage: Alberto E. Rodriguez/Getty

Harry Melling (Dudley Dursley)

If there was any child in the Harry Potter franchise easier to hate than Malfoy, it was Harry's chubby, obnoxious cousin Dudley. Since the series ended, Melling has undergone both weight and fame loss, and he couldn't be happier about it.

Bonnie Wright (Ginny Weasley)

Devon Murray (Seamus Finnigan)

The clumsy kid who's notorious for having potions explode in his face is now a full-grown man with stubble. Murray hasn't done any acting since the Potter films, but he's still an active participant in promotional events for the franchise.

Katie Leung (Cho Chang)

Fans will surely remember the exhilarating and hilariously awkward kiss shared between Harry and Cho in Order of the Phoenix. These days, Leung is a featured character on Hulu's mini-drama "Run."

Image: MJ Kim/GettyImage: Exposay.com/Landmark Photos

Matthew Lewis (Neville Longbottom)

Lewis' transformation from the gawky Neville of the early films into a dashing young man gave hope to bumbling adolescents everywhere. Career-wise, Lewis recently took the leading role in "The Rise," a crime movie about revenge and drug kingpins.

Image: Harry Potter and the Sorcerer's Stone/YouTubeImage: AFP/Getty

Alfie Enoch (Dean Thomas)

The loyal Gryffindor peer and Quidditch teammate of Harry and Ron hasn't done much acting since the Potter films, although he did appear in an episode of BBC's drama "Broadchurch."

Evanna Lynch (Luna Lovegood)

The Hogwarts student who no one could ever really figure out recently starred in the short "It Don't Come Easy" as a shy wallflower, demonstrating that several of the franchise's actors are partially tied to their Hogwarts counterpart for the foreseeable future.

Image: MJ Kim/GettyImage: Danny E. Martindale/Getty

James and Olive Phelps (Fred and George Weasley)

One would think the mischievous pair of twins might want to blaze their own trails after being an on-screen duo for so long. Or they could star as Rosencrantz and Guildenstern in an upcoming production of Hamlet and continue developing their excellent chemistry. That works, too.

Daniel Radcliffe (Harry Potter)

What more is there to say about The Boy Who Lived? Radcliffe has begun the impossible task of separating himself from the iconic role by buddying up with John Hamm in the series "A Young Doctor's Notebook."

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